What type of glue to use with styrofoam and clay?

Hello... So Im building a 3-D model of an animal cell for biology. I'm using a large styrofoam ball as my cell membrane and that's also where everything will be ( the ball will be cut in half and then i'll place everything in the flat side.) I'm also using modeling clay for my smooth and rough endoplasmic reticulum. I need to know what type of glue i should use so that the clay will stick to the styrofoam. Also, is modeling clay a good idea for the smooth and rough endoplasmic reticulum or is there anything else i should use. Please help if you can, I really appreciate it!